Alright. I understand the feeling about the one person you're super close with and joke around, be it on school, college, or work, suddenly getting into a new friend group or getting another friend that he starts hanging out way more than with you. It might actually bring some jealousy and/or sadness. But setting aside the matter of friendship, if Anna actually has feelings for the MC, I honestly would enjoy them together way more than with Ms. Haeseon. Anyway, I see that there's still a long road ahead of character development for me to actually start liking Ms. Haeseon. I look forward for what the author intends.